CHE 161
HW CH#1
GILBERT ED #4
32, 37, 40, 41, 48, 54, 60, 62
1-32
We may observe that silver will sink in water without converting it into another substance, making
this (d) a physical property.
1-37
It is possible to disprove a scientific hypothesis. In fact, many experiments are designed to do just
that as the best test of the hypothesis’s validity.
1-40
Theory is nearly equivalent to fact in science, without being the absolute truth. A theory is hard to
prove absolutely, but has many, many supporting experiments whose observations strongly
support the theory.
1-41
SI units, which were based on the original metric system, can be easily converted into a larger or
smaller unit by multiplying or dividing by multiples of 10. English units are more complicated to
manipulate. For example, to convert miles to feet you have to know that there are 5280 feet in 1
mile and to convert gallons to quarts you have to know that 4 quarts are in 1 gallon.
1-48
The quantities that have three significant figures are (a) 7.02, (c) 6.022X1023, and (d) 302.
1-54
1-60
1-62